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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56246744ba8b370d22e723ae553beeb2abb837fbb036d10778e63c19f99a04e' 
  AND token = '31bO3raL9l4LIzVjmPFlnsqaeOhqIId7D1Yk7S7lqNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}